Evaluation of the dimensional stability of the condensation silicone in different leakage times in moldings for fixed prosthesis
DOI:
https://doi.org/10.34019/1982-8047.2019.v45.26834Keywords:
Dental Impression Materials, Dental Prosthesis, Silicone ElastomersAbstract
Introduction: The aging of the population increases the need for prosthetic rehabilitation and the cost of dental care. To rehabilitate with quality and low cost is necessary to know the dental materials of this process, such as impression materials. The most used in Brazil is condensation silicon, which has limitations. However, the manufacturer modified the formula to improve dimensional stability. Objective: To evaluate the dimensional stability of Speedex condensation silicon with the new DCP technology at different casting times in fixed prosthesis moldings. Material and methods: A standard metal model with two cylinders of the same diameters and the same height was made to simulate a fixed prosthesis. A standard metal tray with drawers and insertion guides was developed. This metal tray was duplicated using reversible alginate. From this, four colorless acrylic trays were reproduced. In total, 20 impressions were made, with 5 impressions per group. The groups were cast with type IV gypsum at different times: group 1 (n = 5): immediate; Group 2 (n = 5): 30 min; group 3 (n = 5): 36h; group 4 (n = 5): 72h. The standard model and all gypsum models of groups 1, 2, 3 and 4 were measured by two researchers blindly using a digital caliper. The external and internal distances between the reference points of the cylinders were analyzed. The groups were compared by Student's t test, the significance level considered was p <0.05. Results: no statistically significant difference was found between researcher 1 and 2 by (p <0.05). There were no differences between groups 1 and 2 and 1 and 3; however, there was a significant difference between 1 and 4. Conclusion: Speedex condensing silicone does not change dimensional stability with leakage within 36 hours.
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